Evaluating matrices of class "sym".

My algorithm returns matrices in the class "sym", of a similar form to the following matrix.

matrix =

[ a^2 + b*c, a*b + b*d]

[ a*c + c*d, d^2 + b*c]

For certain elements of this matrix I wish to allow the symbols involved in the element to assume a value (for the letters a, b, c, d) or the associated operation (for the operators '+', '*'). As such, if a=1, b=2 and c=3,

matrix(1,1)= 1*1 + 2*3

Which would then yield the answer, matrix(1,1) = 7.

Any help would be greatly appreciated.

Regards

Ross

Answer 1

[Andrei Bobrov]

syms a b c d
mtx = [ a^2 + b*c, a*b + b*d; a*c + c*d, d^2 + b*c]
subs(mtx,[a b c ],[1 2 3 ])

[ross montgomery]

Thanks for your help Andrei,

Don't know how I didn't come across this in the help section.

Regards

Ross